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unstable JUST WRITTEN FOR YOU

/ʌnˈsteɪbəl/ · un.sta.ble
adjective
  1. Not firm or steady; liable to fall or change. The unstable structure was a hazard to the people nearby.
  2. Not consistent or reliable; prone to change or variation. The weather forecast was unstable, making it difficult to plan the trip.
noun
  1. A person or thing that is not firm or steady; a hazard. The unstable person was a danger to themselves and others.
Did you know? The word 'unstable' is often used in physics to describe systems that are prone to collapse or change, such as a unstable atomic nucleus or an unstable chemical reaction.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 18, 2026